Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user's computer. This vulnerability affects Firefox ESR < 60.7.2, Firefox < 67.0.4, and Thunderbird < 60.7.2.
Security researchers discover two zero-day vulnerabilities in Mozilla Firefox used in targeted attacks. Editor’s Note: This blog was updated on June 20 to reflect additional information regarding a second vulnerability used in combination with CVE-2019-11707, as well as security updates from Mozilla.